
    <nz-tree-select style="width: 250px"
      [nzNodes]="nodes"
      [nzDefaultExpandAll]="true"
      [nzAllowClear]="false"
      nzPlaceHolder="Please select"
      [(ngModel)]="value"
      [nzMultiple]="true"
      (ngModelChange)="onChange($event)">
    </nz-tree-select>
  